EP4122778A1 - Initiator for a gas generator of vehicle safety device - Google Patents

Initiator for a gas generator of vehicle safety device Download PDF

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Publication number
EP4122778A1
EP4122778A1 EP22166648.0A EP22166648A EP4122778A1 EP 4122778 A1 EP4122778 A1 EP 4122778A1 EP 22166648 A EP22166648 A EP 22166648A EP 4122778 A1 EP4122778 A1 EP 4122778A1
Authority
EP
European Patent Office
Prior art keywords
initiator
cup
pyrotechnic material
adaptor
separator member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22166648.0A
Other languages
German (de)
English (en)
French (fr)
Inventor
Francois Peremarty
Ryan Mark Hubbard
Mason Wayment
Jesse Guymon
Paul Robert Carver
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Autoliv ASP Inc
Original Assignee
Autoliv ASP Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Autoliv ASP Inc filed Critical Autoliv ASP Inc
Publication of EP4122778A1 publication Critical patent/EP4122778A1/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
    • B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/18—Anchoring devices
    • B60R22/195—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type
    • B60R22/1954—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type characterised by fluid actuators, e.g. pyrotechnic gas generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/10—Initiators therefor
    • F42B3/12—Bridge initiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/02—Fuze bodies; Fuze housings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26029—Ignitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26076—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow characterised by casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
    • B60R2021/2642—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic comprising a plurality of combustion chambers or sub-chambers

Definitions

  • the present disclosure generally concerns initiators for gas generators of vehicle safety devices such as inflatable airbags and pretensioned seatbelts. More particularly, the present disclosure relates to an initiator for a gas generator having a primary pyrotechnic material that is hermetically separated from a secondary pyrotechnic material.
  • Inflatable occupant restraint systems including airbags, are commonly included on motor vehicles for passive occupant protection.
  • Airbags used for frontal impact protection are generally installed in the vehicle steering wheel for the driver and behind the vehicle instrument panel for other front seat occupants.
  • inflatable restraints are used for occupant protection from side impacts.
  • side curtain airbags are typically mounted along the roof rail of a vehicle and deploy in a downward direction to provide an energy absorbing structure between the head and upper torso of an occupant and the vehicle interior components. Side airbags may also be carried by a vehicle seat.
  • Inflator devices are employed to produce or supply inflation gas for inflating an inflatable airbag in the event of a collision.
  • the inflator devices for such applications often include a gas generant material stored within the housing of the inflator device and an initiator to actuate the gas generant material when a sensor within the vehicle senses an accident condition (e.g., measures abnormal deceleration). Actuation of the gas generant material triggers inflation of the airbag within a few milliseconds with the produced gas. The inflated airbag cushions the vehicle occupant from impact forces.
  • Initiators are also used for the pretensioning of seatbelts.
  • Initiators may commonly have a first or primary pyrotechnic material and a second or secondary pyrotechnic material.
  • the primary pyrotechnic material is ignited by an electrical signal and in turn ignites the secondary pyrotechnic material. Heat from combustion of the secondary pyrotechnic material ignites gas generant material of the inflator device to produce inflation gases for an airbag.
  • the present teachings provide an initiator for a gas generator of a vehicle safety device which includes a cup defining an interior, a primary pyrotechnic material disposed in the interior of the cup, and a secondary pyrotechnic material disposed in the interior of the cup.
  • a separator member hermetically separates the primary pyrotechnic material from the secondary pyrotechnic material.
  • the present teachings provide an initiator for a gas generator of a vehicle safety device.
  • the initiator includes a cup, a base member, and a separator member.
  • the cup defines an interior and includes a closed end, an open end, and a cylindrical sidewall extending therebetween.
  • the base member is at least partially disposed in the cup.
  • the base member includes an axially extending opening having a portion containing a first pyrotechnic material.
  • the cylindrical sidewall of the cup is attached to the base member about a circumference of the base member.
  • a second pyrotechnic material is disposed in the interior of the cup.
  • the separator member is attached to the base member and closes one end of the axially extending opening to hermetically separate the first pyrotechnic material from the second pyrotechnic material.
  • connection to refers to any form of interaction between two or more entities, including mechanical, electrical, magnetic, electromagnetic, fluid, and thermal interaction. Two components may be coupled to each other even though they are not in direct contact with each other.
  • adjacent refers to items that are in close physical proximity with each other, although the items may not necessarily be in direct contact.
  • fluid communication refers to two features that are connected such that a fluid within one feature is able to pass into the other feature.
  • Exemplary as used herein means serving as a typical or representative example or instance, and does not necessarily mean special or preferred.
  • an initiator for a gas generator of a vehicle safety device in accordance with the present teachings is illustrated and generally identified at reference character 10.
  • the initiator 10 may be part of an occupant restraint system of a motor vehicle that includes a gas generator and an inflatable airbag (not particularly shown), for example.
  • the particular inflator or pyrotechnical inflator 10 shown in the drawings is particularly adapted for a driver side front airbag of an occupant restraint system. It will be understood, however, that the initiator described herein can be used in many other pyrotechnical devices within the scope of the present teachings. It will be understood, however, that various aspects of the present teachings may be readily adapted for use with other airbags or with seatbelt pretensioners.
  • the initiator 10 is generally illustrated to include a cup or case 12, a first or primary pyrotechnic material, and a second or secondary pyrotechnic material 16.
  • the primary and secondary materials are disposed or stored in an interior 18 of the cup 12.
  • the cup 12 includes a cylindrical sidewall 20 and a circular base.
  • the cylindrical sidewall 20 that extends along an axis A of the initiator 10 between a closed end 22 and an open end 24.
  • the cup 12 may be formed of metal and may be formed by cold striking.
  • the cup 12 may be formed by stamping a sheet of nickeled steel, such as DC04 or DC06 and may have a thickness between 0.3 and 0.6 mm.
  • the cup 12 is preferably formed to include a plurality of weakened zones 26.
  • the weakened zones 26 of the cup 12 open in response to a pressure from within the cup 12 generated by combustion of the secondary pyrotechnic material 16.
  • the sidewall 20 includes four weakened zones 26 uniformly distributed around the axis A.
  • the plurality of weakened zones 26 can be varied in configuration or number within the scope of the present teachings.
  • the first pyrotechnic material 14 is distinct from the secondary pyrotechnic material 16.
  • the primary pyrotechnic material 14 may be separated from the secondary pyrotechnic material 16 within the interior 18 of the cup 12 by a separator member 28.
  • the primary pyrotechnic material 14 may be in the form of a slurry.
  • the secondary pyrotechnic material 16 may be a granulated material, including but not limited to a boron based material. It will be understood the particular pyrotechnic materials are outside of the scope of the present teachings and may be selected from various pyrotechnic materials well known in the art.
  • the initiator 10 of the present teachings may further include an adaptor or base member 30.
  • the adaptor 30 functions to contain the first pyrotechnic material 14 and to provide an interface between the cup 12 and the separator member 28.
  • the adaptor 30 may be formed of stainless steel or other suitable material.
  • One suitable material is Type 304L stainless steel.
  • the adaptor 30 is cylindrical in shape and includes a stepped configuration having a first or lower portion 32 and a second or upper portion 34. The first portion 32 has a first diameter and the second portion 34 has a smaller, second diameter.
  • the adaptor 30 is at least partially disposed in the cup 12. As shown, the adaptor 30 is completely or substantially completely disposed in the cup 12. The adaptor 30 is sized to be received within the open end 24 of the cup 12. The cylindrical sidewall 20 of the cup 12 may be attached to the adaptor 30 about a circumference of the adaptor 30. In the embodiment illustrated, the first portion 32 of the adaptor 30 may be welded to the cup 12.
  • the first portion 32 of the adaptor 30 defines a central opening 36 that receives an ignition device 38.
  • the ignition device 38 conventionally includes a pair of electrical connectors or pins 40 and a bridge wire 42.
  • the pair of electrical pins 40 are in reaction initiating communication with the first pyrotechnic material 14 through the bridge wire 42. In this regard, an electrical current delivered to the pins 40 will serve to melt the bridge wire 42 and ignite the first pyrotechnic material 14.
  • the second portion 34 of the adaptor 30 defines a central cavity 44.
  • the cavity 44 contains the primary pyrotechnic material 14.
  • the cavity has an open end that is closed by the separator member 28.
  • the separator member 28 hermetically separates the primary pyrotechnic material 14 from the secondary pyrotechnic material 16.
  • the term "hermetically" describing the separation between the primary and secondary pyrotechnic materials 14 and 16 shall mean that the primary and secondary materials 14 and 16 are completely sealed from one another.
  • the hermetic seal between the primary pyrotechnic material 14 and the secondary pyrotechnic material 16 provides a mechanical separation that eliminates or substantially eliminates any chemical incompatibility between the primary pyrotechnic material 14 from the secondary pyrotechnic material 16 that may otherwise degrade or shift performance of the initiator 10.
  • the separator member 28 includes a cylindrical sidewall 46.
  • the cylindrical sidewall 48 extends along the axis A of the initiator 10 between a closed end 48 and an open end 50.
  • the closed end 48 defines a disk-shaped portion.
  • the separator member 28 may be formed of metal and may be formed by cold striking. In one particular example, the separator member 28 may be formed by stamping a sheet of stainless steel.
  • the cylindrical sidewall 46 of the separator member 28 may be welded or otherwise securely attached to the second portion 34 of the adaptor 30. While the separator member 28 is shown and described as being cylindrical, the separator member may alternatively be disk only in shape (i.e., not including the sidewall 46). With such an alternative shape, the separator member 28 may be welded or otherwise suitably attached to the upper axial end of the second portion 34 of the adapter 30.
  • the closed end or disk-shaped portion 48 of the separator member 28 may be formed to include a weakened zone 52.
  • the weakened zone 52 which may be stamped into the disk-shaped portion 48, is configured to open in response to a pressure in the cavity 44 of the adapter 30 generated by combustion of the first pyrotechnic material 14.
  • the weakened zone 52 includes a plurality of radially extending arms 54. The arms 54 are shown to originate from a common point 56 at a radial center of the disk-shaped portion 48.
  • the configuration of the weakened zone 52 may vary within the scope of the present teaching.
  • the initiator 28 of the present teachings is shown to further include an insulated resistance cover or static cover 58 and an elastomeric overmolding or overmolded member 60.
  • These elements 58 and 60 will be understood to be conventional insofar as the present invention is concerned.
  • the overmolded member 60 may be an injection mold of a glass filled nylon 6 material.
  • the static cover 58 may be constructed of nylon 6 or other plastic material.
  • an electrical current is delivered to the pins 40 of the ignition device 38.
  • the current melts the bridge wire 42 that in turn ignites the primary pyrotechnic material 14.
  • Ignition of the primary pyrotechnic material 14 creates a pressure within the chamber 44 of the adaptor 30 which opens the weakened zone 52 of the separator member 28.
  • Heat from the ignition of the primary pyrotechnic material 14 is vented through the opened weakened zone and ignites the secondary pyrotechnic material 16.
  • Pressure from combustion of the secondary pyrotechnic material 16 opens the weakened zones 26 of the cup 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP22166648.0A 2021-04-19 2022-04-05 Initiator for a gas generator of vehicle safety device Pending EP4122778A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17/233,582 US11760303B2 (en) 2021-04-19 2021-04-19 Initiator for a gas generator of vehicle safety device

Publications (1)

Publication Number Publication Date
EP4122778A1 true EP4122778A1 (en) 2023-01-25

Family

ID=81325709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22166648.0A Pending EP4122778A1 (en) 2021-04-19 2022-04-05 Initiator for a gas generator of vehicle safety device

Country Status (4)

Country Link
US (1) US11760303B2 (zh)
EP (1) EP4122778A1 (zh)
JP (1) JP7325567B2 (zh)
CN (1) CN115214521A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11760303B2 (en) 2021-04-19 2023-09-19 Autoliv Asp, Inc. Initiator for a gas generator of vehicle safety device

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WO2002083458A2 (en) * 2001-04-10 2002-10-24 Breed Automotive Technology, Inc. Gas generator
US20050206145A1 (en) * 2004-02-25 2005-09-22 Kazuhiro Kato Rupturable member
EP1731383A1 (en) * 2004-03-30 2006-12-13 Nippon Kayaku Kabushiki Kaisha Metal holder with electrode pin, method of manufacturing the metal holder, and gas generator
WO2009091624A1 (en) * 2008-01-14 2009-07-23 Autoliv Asp, Inc. Pyrotechnic cup
EP2589920A2 (en) * 2011-11-02 2013-05-08 Indet Safety Systems a.s. High performance initiator
US20150107477A1 (en) * 2013-10-21 2015-04-23 Trw Airbag Systems Gmbh Igniting unit, especially for an inflator, inflator, airbag module, vehicle safety system and method of manufacturing an igniting unit
FR3030715A1 (fr) * 2014-12-22 2016-06-24 Ncs Pyrotechnie Et Tech Sas Etui d'allumeur
DE102017130969A1 (de) * 2017-12-21 2019-06-27 Trw Airbag Systems Gmbh Anzündeinheit, Gasgenerator, Gassackmodul, Fahrzeugsicherheitssystem und Verfahren zum Herstellen einer Anzündeinheit

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Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029671A1 (en) * 1979-11-20 1981-06-03 Ici Americas Inc. Electrostatic safety element for an electric initiator
US5140906A (en) * 1991-11-05 1992-08-25 Ici Americas, Inc. Airbag igniter having double glass seal
US5621183A (en) * 1995-01-12 1997-04-15 Trw Inc. Initiator for an air bag inflator
WO2002083458A2 (en) * 2001-04-10 2002-10-24 Breed Automotive Technology, Inc. Gas generator
US20050206145A1 (en) * 2004-02-25 2005-09-22 Kazuhiro Kato Rupturable member
EP1731383A1 (en) * 2004-03-30 2006-12-13 Nippon Kayaku Kabushiki Kaisha Metal holder with electrode pin, method of manufacturing the metal holder, and gas generator
WO2009091624A1 (en) * 2008-01-14 2009-07-23 Autoliv Asp, Inc. Pyrotechnic cup
EP2589920A2 (en) * 2011-11-02 2013-05-08 Indet Safety Systems a.s. High performance initiator
US20150107477A1 (en) * 2013-10-21 2015-04-23 Trw Airbag Systems Gmbh Igniting unit, especially for an inflator, inflator, airbag module, vehicle safety system and method of manufacturing an igniting unit
FR3030715A1 (fr) * 2014-12-22 2016-06-24 Ncs Pyrotechnie Et Tech Sas Etui d'allumeur
DE102017130969A1 (de) * 2017-12-21 2019-06-27 Trw Airbag Systems Gmbh Anzündeinheit, Gasgenerator, Gassackmodul, Fahrzeugsicherheitssystem und Verfahren zum Herstellen einer Anzündeinheit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11760303B2 (en) 2021-04-19 2023-09-19 Autoliv Asp, Inc. Initiator for a gas generator of vehicle safety device

Also Published As

Publication number Publication date
JP2022165390A (ja) 2022-10-31
CN115214521A (zh) 2022-10-21
KR20220144325A (ko) 2022-10-26
JP7325567B2 (ja) 2023-08-14
US11760303B2 (en) 2023-09-19
US20220332278A1 (en) 2022-10-20

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